jOOλ is part of the jOOQ series (along with jOOQ, jOOX, jOOR, jOOU) providing some useful extensions to Java 8 lambdas. It contains these classes:

Lambda expressions and checked exceptions are a major pain. Even before going live with Java 8, there are a lot of Stack Overflow questions related to the subject:

• http://stackoverflow.com/q/18198176/521799
• http://stackoverflow.com/q/19757300/521799
• http://stackoverflow.com/q/14039995/521799

The Unchecked class can be used to wrap common @FunctionalInterfaces in equivalent ones that are allowed to throw checked exceptions. E.g. this painful beast:

Arrays.stream(dir.listFiles()).forEach(file -> {
    try {
        System.out.println(file.getCanonicalPath());
    }
    catch (IOException e) {
        throw new RuntimeException(e);
    }

    // Ouch, my fingers hurt! All this typing!
});

... will become this beauty:

Arrays.stream(dir.listFiles()).forEach(
    Unchecked.consumer(file -> { System.out.println(file.getCanonicalPath()); })
);

JDBC should be as simple as this in Java 8:

SQL.stream(stmt, Unchecked.function(r ->
    new SQLGoodies.Schema(
        r.getString("FIELD_1"),
        r.getBoolean("FIELD_2")
    )
))
.forEach(System.out::println);

(where SQLGoodies.Schema is just an ordinary POJO).

For more details and other options to write SQL in Java 8, visit this website here:

http://www.jooq.org/java-8-and-sql